Piston for pumps.



PATENTBD Nov. 27, 1906,-

T. H. GALLAGHBR. PISTON FOR PUMPS. APPLI0ATI0N-11L3D Nov.24,19o5.

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`1 TED STAT-ES PATENT orrron.

THOMAS H. GALLAGHER, OF CARNEGIE, PENNSYLVANIA, ASSIGNOR TO THE HOUGH PUMP COMPANY, OF FRANKLIN, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

PISTON FOR PUMPS.

Specicaton of Letters Patent.`

Patented Nov. 27, 1906.

To all whom it may concern:

Be it known that I, THOMAS H. GALLA- GHER, a citizen of the United States of America, residing at Carnegie, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Pistons for Pumps, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in pistons for pumps, and the invention relates more particularly to a piston for pumps adapted to be used in Artesian and oil wells.

The invention aims to provide a4 novel form of piston wherein positive and reliable means are provided for sustaining a pressure above the piston irrespective of the depth of the well in connection with which the piston is used. In this connection the invention is primarily intended to be used 1n oil-wells where large quantities of oil are pumped from the bottom of a deep well, it being necessary that the piston be subjected to the pressure of oil above the piston in a working barrel. Considerable trouble has been experienced in providing a packing which will maintain a non-.leakable frictional engagement with the working barrel in which it is placed, and to this end I have devised positive means adapted to be actuated by the pressure above the piston to insure a nonleakable connection between the piston and the barrel or casing in which it operates. In connection with oil-wells my improvedworking piston is adapted to be used in conjunction with a standing or the like valve, and therefore forms an important adjunct to the working mechanism employed for drawing oil from a well.

With the above and other objects in view, which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts to be hereinafter more fully described and then claimed, and, referring to the drawings accompanying this application, like numerals of reference designate corresponding parts throughout the several views, in which- Figure 1 is a side elevation of my improved piston for pumps. Fig. 2 is a cross-sectional view taken on the line x of Fig. 1.

Fig. 3 is a similar view taken on the line y y of Fig. 4, and Fig. 4 is a vertical sectional view of my improved piston mounted in a working barrel or casing. y

To put my invention into practice, my improved piston is constructed of a tubular member 1, having a lower contracted screwthreaded end 2 and carrying a head 3 upon its upper end. The head 3 is provided with an annular recess 4 and is exteriorly screw-threaded, as at5, to receive a crown 6, said crown forming part of a valve mechanism carried by the tubular member 1. Seated in the recess 4 is a flanged collar 7, which is retained within its recess by the crown 6. vThe collar 7 serves fuctionally as a seat for a spherical body or ball 8, which is housed within the crown 6. The crown carries a screw-threaded shank 9 upon its upper end in order that a stem(not shown) may be secured thereto to permit of the piston being operated.

The lower edges of the head 3 are cut away, forming an annular flanged recess 10, the object of which will be presently described. Upon the screw-threaded contracted end 2 of the member 1 is mounted a collar 11, having an annular recess 12 formed therein. The collar isretained upon the tubular member 1 by the screw-threads of the,lower end, also by a jam-nut 14, mounted upon the end 2 of the member 1.

Mounted between the head 3 of the member 1 and the collar 11 is a resilient sleeve 15, which is slit, as at 16. The sleeve is preferably made of a resilient metal, and the confronting edges 17 and 17a of the sleeve are adjustably interlocked by providing the edges 17 and 17 a with recesses 18 and tongues 19, adapted to engage in said recesses. The sleeve is provided with tapering ends 2O and 21, the tapering end 21 adapted to engage in the annular recess 12 of the collar 11, while the tapering end 2O is adapted to engage in the flanged recess 10 of the head 8. The tapering end 20 is provided with a plurality of circumferentiallyarranged openings 22.

Mounted between the sleeve 15 and the tubular member 1 of the piston is a plurality of rings of packing 23, said packing being of a conventional form, such as rubber or the like resilient material.

In the accompanying drawings I have IOO IOS

illustrated a piston in connection with a working barrel 24 of a well, and it will be observed that the sleeve 15 snugly fits the inner walls of the barrel 24, while an annular space exists between the head 3 and the crown 6 of the working barrel. This permits of the pressure of liquid above the piston entering the opening 22 of the sleeve 15 and exerting a pressure upon the top of the packing 23. The oil or what liquid it may be seeps or percolates through the packing and causes a pressure to be exerted against the inner sides of the sleeve 15, causing the same to expand and frictionally engage the inner walls of the barrel 24. The greater the pressure exerted upon the inner walls of the sleeve 15 the greater the frictional engagement of the sleeve with the working barrel, and as the lower end of the sleeve is closed and the spherical body 8 is seated upon the top of the tubular member 1 it will be impossible for the liquid to pass below the piston.

In operation the downward stroke of the piston causes the oil to pass upwardly through the tubular member 1, unseating the spherical body 8 and permitting of oil passing through the crown 6 into the working barrel above the piston. The upward stroke of the piston seats the spherical body and raises the oil above the piston, the pressure of said oil at all times maintaining a nonleakable connection between the piston and the working barrel. It will thus be seen that I have devised positive and reliable means for effecting a perfect connection between the piston and a working barrel, and the construction of my improved valve permits of the same being readily disassembled in case it is desired to renew any parts thereof, the same being extremely simple in construction, strong and durable, and free of all danger of being injured. I

Such changes in the construction and operation of the piston as are permissible by the appended claims may be resorted to without departing from the spirit and scope of the invention,

What I claim, and desire to secure by Let- 1. The combination with a casing or barrel, of a reciprocating tubular member, a head" carried at one end of said member, a crown-valve carried by said head, a collar carried by the lower end of said member, a resilient sleeve mounted betweenl said collar and said head, said sleeve having openings formed in its upper end, resilient packing interposed between said sleeve and said tubular member, means to retain said collar upon said member, substantially as described.

2. The combination with a barrel, of a reciprocatory tubular member, a crown-valve carried by the upper end of said member, a resilient sleeve surrounding said member, resilient packing interposed between said sleeve-and said member, said sleeve having openings formed in its upper end, means to retain said sleeve in engagement with said member, substantially as described.

3. The combination with a barrel, of a tubular member, a head carried by one end of said member, a collar carried by the opposite end of said member, a resilient sleeve interposed between said head and said collar, said sleeve having openings formed therein, a packing interposed between said sleeve and said member, means to retain said collar upon said member, substantially as described.

4. A piston-pump embodying a tubular member, a resilient -sleeve carried by said member, packing interposed `between said sleeve and said member, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

THOMAS H. GALLAGHER. 

